Dual-pulse laser induced breakdown spectroscopy: Time-resolved transmission and spectral measurements

Local equivalence ratio measurements in turbulent partially premixed flames using laser-induced breakdown spectroscopy

“…In solid, the reduced density behind the shock wave of the first plasma enhances the second laser's interaction with the solid sample, while simultaneously reducing the plasma coupling with the gaseous matrix; thereby increasing the analyte response of the solid. In our case, there is a moderate enhancement in the doublepulse LIBS signal of gas mixture due to the transmition of the second laser pulse energy through the created plasma by the first laser [18], and also due to the expanding shockwave generated of the laserinduced plasma that would push out the gas molecules within the plasma core, producing a decreased concentration of analyte for gasphase species. In addition to this depletion of the analyte, the significantly reducing coupling of the second laser into the existing plasma counteracts dual-pulse advantages [7].…”

Double pulse laser ablation and plasma: Laser induced breakdown spectroscopy signal enhancement

“…Table 1 lists the suggested configurations of double pulse LIBS. [6,13,[20][21][22]28,29] One laser/two laser configuration [2,30] Combination of different pulse durations [3,21,22,31] Pre-pulse/re-heating mode [1,13,14,19,21,22] Wavelength combination [26,32] Pulse energy combination [1,[23][24][25] …”

Time-resolved spectroscopy and imaging diagnostics of single pulse and collinear double pulse laser induced plasma from a glass sample

“…For example, Stratis et al [15] observed no signal enhancement compared to the single ablation regime in plasma re-heating arrangement but obtained increased emissions for Cu and Al in glass using a preablation laser spark in dual-pulse LIBS. A roughly 50% increase as compared to the single-pulse regime in Mg and Si atomic emission intensities from plasma of a glass sample was recorded by Hohreiter and Hahn [16] who used the orthogonal dual-pulse excitation scheme. Apparently, the different characteristics of matrices lead to the different laser-induced plasma evolutions in the double-pulse configuration.…”